Dryer stops with E13; on heat pump models, compressor may not start or may shut down quickly.

Safety first: Unplug the dryer. The heat pump circuit is a sealed refrigeration system; do not attempt to open or recharge it without proper qualifications.

• Clean all filters and condenser: Ensure the lint filter and condenser are completely clean to reduce load on the heat pump system.
• Inspect heat pump fan: Remove the side or rear panel to access the heat pump fan. Clean lint from the blades and housing. Confirm the fan spins freely and is not obstructed.
• Listen for compressor operation: During a test cycle (with panels safely in place), listen for the compressor starting. If it repeatedly tries and fails, or does not start at all, a compressor or control fault is likely.
• Check sensors and wiring: Inspect wiring to any pressure or temperature sensors on the heat pump circuit. Replace any sensor that is open, shorted, or out of specification.
• Professional service: If the sealed system (compressor, refrigerant circuit) is suspected, contact a qualified refrigeration technician. Do not attempt sealed system repairs yourself.